Mounting brake support on square trailer axles



-H. R. SILVER 1,961,174

MOUNTING BRAKE SUPPORT ON SQUARE TRAILER AXLES June 5, 1934.

Original F iled May 31, 1932 fi'yj H 5.

I1 Verzfor J/erfier/ 1Q S/[Vel Patented June 5, 1934 I UNITED STATES PATENT OFFICE R MOUNTING BRAKE SUPPORT ON SQUARE TRAILER AXLES Herbert R. Silver, Louisville, Ky.

Application May 31, 1932, Serial No. 614,331 Renewed November 4, 1933 3 Claims. (Cl. 188206) In the manufacture of trailers, the brake suprounded end portion 2 of the usual shape. The ports must be rigidly mounted on the axles. In brake support or hub 3 is also composed of any connection with rectangular or square axles it suitable ductile metal which is cast into the has been proposed heretofore to obtain the deform shown. This hub is cast with the usual sired rigidity by forcing the parts together. square bore extending from one end of the hub Since the axle is usually composed of rolled steel toward the other end where it terminates in a and the braking support of some ductile material round bore. The wall surface defining the bore such as cast steel, malleable iron or brass, which consists of a round axle-engaging portion 4 at is cast in the form, these parts not only have a one end, a square axle-engaging portion 5 at the 10 rough, uneven surface but, in addition, vary in other end, and an intermediate or connecting dimensions, although identically produced. Consquare portion 6, the bore of which is made sequently, it has been the practice to machine larger than the bore at 5 so as to provide, when these parts to provide uniform dimensions and parts are fitted together, a clearance 7 between surface conditions which would permit them to the hub and the axle. The cross dimensions of 5 be forced together and cause them to fit so tightly the portion 6 may, if desired, be made the same and uniformly as to produce the desired rigidity. as that of 5. I have determined, however, that To avoid the expense of machining, it has also the desired rigidity can be obtained when the been proposed to weld the parts when loosely clearance '7 is provided, and, therefore, prefer fitted together or make the brake support in two having this clearance inasmuch as the pressure Y 20 pieces, bolting it together around the axle. Of otherwise required to force the parts together these modes the first mentioned is perhaps the would be greater. more desirable, because it combines unchanging As stated previously the dimensions of the axle or constant rigidity with removability, whereas and hub vary within certain limits. For example the welded structure is not removable, while the an axle which is intended to be 2%" square will 25 bolted structure is apt to become loose from time ordinarily vary from & of an inch under the to time. intended dimensions to of an inch over the The present invention is directed to an ar intended dimensions. The cross dimensions of rangement of the first type mentioned and prothe square bore of the hub is ordinarily intended poses an improvement whereby the expense ento be 5 of an inch smaller than the correspond- 30 tailed therein is substantially reduced without ing dimensions of the axle, and consequently, for

effecting the rigidity or the removability. This a 2%" axle the dimensions of the bore are inis accomplished by forcing the parts together tended to be 22-1 square. This, however, is subwithout machining them. I have discovered that ject'to variations from of an inch under to the majority of variations in dimensions uninothing over the intended dimensions. To facili- 35 formly occur within certain limits, that subtate a comparison of these dimensions they are stantially all of these variations can be held given in the following table with the fractions within these limits without special care and that all reduced to thirty-seconds: within these variations and despite the roughness of their surfaces, the parts can be forced Dimensions 40 together, without creating undue strain, into a Small intended Large fit equally as rigid and desirable as that obtained when the parts are machined. Axle 2 2 542 2 The invention is illustrated in the accompany Hub bore 22342 22%? drawing wherein: 45 Figure 1 is an end elevation of the brake sup- It will be noted that with these variations 00- port onasquare axle; curing, the bore will vary from T to of an Figure 2 is a section partly in elevation along inch smaller in cross dimensions than the axle. line 2-2 of Figure 1; and It is easily possible with ordinary care to main- Figures 3 and 4 are sections along lines 33 tain the variations in dimensions within the lim- 50 and 4-4 respectively of Figure 2 with one-half its noted, but it should be understood that it of the axle broken away. i is necessary only to maintain the variations of In carrying out my invention I provide an axle the bore within the limits ranging from zero 1, preferably of square or other suitable rectanguto of an inch smaller than the axle. lar shape, which is composed of some suitable With the parts unmachined and varying with- 1. b5 metal such as rolled steel and provided with a in the limits last mentioned rigid securement of 11v the hub will result without undue strain when the parts are forced together. The forcing of the hub upon the axle can be carried out by any suitable means (not shown) and without the application of heat.

Naturally there will be some strain centered around the corners of the parts as a result of their difference in dimensions, and this strain will increase as their difference in dimensions increase. While the strain created within the limits noted will not be unduly large, it is possible to relieve it somewhat by cutting away the corners of the axle-engaging bore-portion 5 as indicated at 8. Of course, the same result could be obtained by cutting off the corresponding corners of the axle.

Having described my invention I claim:

1. In a trailer, a combination with a square axle of an integral hub mounted on said axle, said hub having a square bore-portion, and an axle-engaging, unmachined surface within said portion, one original cross dimension of which is not substantially greater than of an inch smaller than the original corresponding dimension of said axle.

2. In a trailer, the combination with a square axle, an integral hub mounted on said axle, said hub having a square bore-portion and said axle having within said portion an uninachined, hubengaging surface, one original cross dimension of which is not substantially more than of an inch larger than the original corresponding dimension of said bore portion.

3. In a trailer, a combination with a square axle of an integral hub mounted on said axle, said hub having a square bore-portion, and said parts having within said. portion unmachined, mutually-engaging surfaces, the original cross dimensions of the axle-engaging surfaces of the bore being not substantially greater than of an inch smaller than the original corresponding dimensions of said axle.

HERBERT R. SILVER. 

